Kaido's future sight usage is sus. He only used it once is my guess. Up till then, he just face tanked everything. He specifically said, "You're not the only one who can see into the future" Before using it....
Also, are you saying that King of Hell zoro's adv coc attack is weaker than asura?
KOH was an overkill
Dragon Damnation nearly killed King, mutilated him, destroyed his strongest attack, his Haki coated sword.
Ashura doesn't have to do all that but just k.o King.
Also dragon Damnation is mid tier base Zoro move.
Ashura is 3 times as strong as base Zoro.
KoH ashura would be like shit we have never seen before. Probably far stronger than Bajrang gun